An Etymological Dictionary of the German Language/Egge
Egge, f., ‘harrow,’ simply ModHG., from LG. egge; likewise eggen from LG., because a corresponding HG. word would be ecken or egen. The MidHG. word is ęgede, OHG. ęgida, f., ‘harrow,’ OHG. ęcken (partic. gi-ęgit), ‘to harrow,’ MidHG. ęgen. Comp. Du. egge, AS. ęgeðe; Goth. *agjan, ‘to harrow,’ *agiþa, ‘harrow,’ are not recorded. The Teut. root ag (ah), ‘to harrow,’ from pre-Teut. ak, ok, is most closely connected with Lat. occa, ‘harrow,’ Lith. akėiti, ‘to harrow,’ akėczos, ‘harrow,’ OCorn. ocet, W. oged, ‘harrow.’ The West Eur. cognates may also be further connected with Ecke (Lat. acies).
Egge, is derived rather, like Roggen, from UpG. (Swiss egge, pronounced ecke), but the pronunciation of the gg was softened in LG., probably on account of the spelling (see Epheu); yet egge is also Livonian. In MidG. and LG. the harrow is called écke (in MidG. also êke). The term for 'wheat' (Weizen) seems also to be influenced by UpG.